CAS 16504-57-7 appears in our catalog under these names: (S)–3–Amino–4–hydroxybutanoic acid, H-D-beta-HSer-OH, H-D-β-HoSer-OH 97%, (S)-3-Amino-4-hydroxybutanoic acid, 97%, 97%, (S)-3-Amino-4-hydroxybutanoic acid, 97.0%. Offered by: GLPBio, Iris Biotech, Ambeed, Chemat, MedChemExpress. Available pack sizes: 10mg, 25mg, 50mg, 1g, 5g, 250mg, 10g, 100mg.